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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '661e89edffc4767a518990e3c2a22d8089881f9e571fe86b1631c74fea225315' 
  AND token = '0itEJa7PBXg5oXcGC0+se1K8ffeOX53tcrUrUqtucjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}